On Mon, 26 Jan 2004, Steve Harris wrote: > On Mon, Jan 26, 2004 at 11:54:26 +0100, Joern Nettingsmeier wrote: > > >This is not quite correct. While humans can not hear continuous tones over > > >20-odd kHz that is not the whole story, the frequency reproduction also > > >limits the minimum transient rise time, which is detected by a different > > >part of the ear (IIRC, IANABiologist and my psychoacoustics textbook is at > > >work). > > > > interesting point. but isn't membrane inertia the limiting factor in > > transient reproduction anyway? > > Which membrane? sorry for not being clear, i was thinking of the speaker membrane of the playback system. just guessing, though. > The basilar membrane is responsible for frequency alaysis > (AFAIR), but its limited by its geometry. Doesn't it detect resonances in > the narrowing tube? Transients could be detected before the pressure wave > reaches the basilar membrane, though I'm just guessing here. > > > my naive understanding is that min rise time = nyquist freq. if we > > cannot perceive frequencies above, say, 20k, all we win by faster > > sampling is more accurate timing information. > > but there is a worst-case "timing error" of 1/24000 sec, which does not > > seem much to me... > > Its not the timing error - it wont be quatised to the nearest sample > AFAIK, but you will get substantial ripple from the reconstruction filters > fi you try to reproduce transients near nyquist- dunno how that is perceived. > > > i'd like to read more, but i haven't been able to google anything up > > about transient perception and reproduction. any pointers? > > There seems to be some relevent stuff here: > http://arjournals.annualreviews.org/doi/full/10.1146/annurev.neuro.23.1.285 > but its a bit over my head. drat. it's "pay per view". :( but i guess i wouldn't understand anything anyway.
